I have a two year old Accurate aluminum mold that Has left scratches on the top of the blocks.These appear to be from the sprue plate. I had this problem with a Lee mould and open gave it away after not being able to solve the problem. I have been using an NEI mould for twenty five years and ad have never had a problem. what do I need to do? I have tried cleaning and lubing . I love the boollit's from the Accurate mold but hate messing with it .